Subjects: war
- World War, 1914-1918 -- Secret service -- Fiction
- World War, 1914-1918 -- Secret service -- Germany
- World War, 1914-1918 -- Secret service -- Great Britain
- World War, 1914-1918 -- Secret service -- United States
- World War, 1914-1918 -- Sermons
- World War, 1914-1918 -- Social aspects -- England -- Fiction
- World War, 1914-1918 -- Societies, etc.
- World War, 1914-1918 -- Songs and music
- World War, 1914-1918 -- Soviet Union
- World War, 1914-1918 -- Switzerland -- Fiction
- World War, 1914-1918 -- Technology
- World War, 1914-1918 -- Territorial questions
- World War, 1914-1918 -- Territorial questions -- Latvia
- World War, 1914-1918 -- Territorial questions -- Turkey
- World War, 1914-1918 -- Territorial questions -- Ukraine
- World War, 1914-1918 -- Territorial questions -- Yugoslavia
- World War, 1914-1918 -- Transportation
- World War, 1914-1918 -- Treaties
- World War, 1914-1918 -- Trench warfare
- World War, 1914-1918 -- Trench warfare -- Juvenile fiction
- World War, 1914-1918 -- Turkey
- World War, 1914-1918 -- United States
- World War, 1914-1918 -- United States -- Equipment and supplies
- World War, 1914-1918 -- United States -- Fiction
- World War, 1914-1918 -- United States -- Juvenile fiction
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